TCTN3 Mutations Cause Mohr-Majewski Syndrome

• Published in: American journal of human genetics Vol. 91; no. 2; pp. 372 - 378
• Main Authors: Thomas, Sophie, Legendre, Marine, Saunier, Sophie, Bessières, Bettina, Alby, Caroline, Bonnière, Maryse, Toutain, Annick, Loeuillet, Laurence, Szymanska, Katarzyna, Jossic, Frédérique, Gaillard, Dominique, Yacoubi, Mohamed Tahar, Mougou-Zerelli, Soumaya, David, Albert, Barthez, Marie-Anne, Ville, Yves, Bole-Feysot, Christine, Nitschke, Patrick, Lyonnet, Stanislas, Munnich, Arnold, Johnson, Colin A., Encha-Razavi, Férechté, Cormier-Daire, Valérie, Thauvin-Robinet, Christel, Vekemans, Michel, Attié-Bitach, Tania
• Format: Journal Article
• Language: English
• Published: Cambridge, MA Elsevier Inc 10.08.2012; Cell Press; Elsevier
• Subjects: Adolescent; Base Sequence; Biological and medical sciences; Bone dysplasia; Brain; Brain mapping; Cerebellum - abnormalities; Cerebellum - pathology; Child; Cleft Palate - genetics; Cleft Palate - pathology; Congenital defects; Data processing; Diseases of the osteoarticular system; Exome - genetics; Fetus - pathology; Fetuses; Foot Deformities, Congenital - genetics; Foot Deformities, Congenital - pathology; Fundamental and applied biological sciences. Psychology; Genetic disorders; Genetics of eukaryotes. Biological and molecular evolution; Genomics; Genotype & phenotype; Hand Deformities, Congenital - genetics; Hand Deformities, Congenital - pathology; Hedgehog protein; Hedgehog Proteins - metabolism; Homozygote; Humans; Intracellular Signaling Peptides and Proteins - genetics; Kidney; Malformations and congenital and or hereditary diseases involving bones. Joint deformations; Medical genetics; Medical sciences; Membrane Proteins - genetics; Missense mutation; Molecular and cellular biology; Molecular Sequence Data; Mutation; Mutation - genetics; Neurodevelopmental disorders; Oral cavity; Orofaciodigital syndrome; Orofaciodigital Syndromes - genetics; Orofaciodigital Syndromes - pathology; Phenotype; Polydactyly; Proteins; Rib; Sequence Analysis, DNA; Signal transduction; Signal Transduction - genetics; Young Adult; Stomatology; Diseases of the osteoarticular system; Dysostosis; Genetics; Mohr syndrome; Mutation; Osteochondrodysplasia; Majewski syndrome; Genetic disease
• ISSN: 0002-9297; 1537-6605; 1537-6605
• DOI: 10.1016/j.ajhg.2012.06.017

Orofaciodigital syndromes (OFDSs) consist of a group of heterogeneous disorders characterized by abnormalities in the oral cavity, face, and digits and associated phenotypic abnormalities that lead to the delineation of 13 OFDS subtypes. Here, by a combined approach of homozygozity mapping and exome ciliary sequencing, we identified truncating TCTN3 mutations as the cause of an extreme form of OFD associated with bone dysplasia, tibial defect, cystic kidneys, and brain anomalies (OFD IV, Mohr-Majewski syndrome). Analysis of 184 individuals with various ciliopathies (OFD, Meckel, Joubert, and short rib polydactyly syndromes) led us to identify four additional truncating TCTN3 mutations in unrelated fetal cases with overlapping Meckel and OFD IV syndromes and one homozygous missense mutation in a family with Joubert syndrome. By exploring roles of TCTN3 in human ciliary related functions, we found that TCTN3 is necessary for transduction of the sonic hedgehog (SHH) signaling pathway, as revealed by abnormal processing of GLI3 in patient cells. These results are consistent with the suggested role of its murine ortholog, which forms a complex at the ciliary transition zone with TCTN1 and TCTN2, both of which are also implicated in the transduction of SHH signaling. Overall, our data show the involvement of the transition zone protein TCTN3 in the regulation of the key SHH signaling pathway and that its disruption causes a severe form of ciliopathy, combining features of Meckel and OFD IV syndromes.